Studies have shown that exercise can help reduce the risk of a breast cancer recurrence and other health problems. But for many breast cancer survivors, starting or maintaining an exercise program isn’t easy. Researchers are developing an online exercise program for female breast cancer survivors that uses acceptance and mindfulness principles to encourage living a physically active, healthy lifestyle. This study will finalize the development of this exercise program. The initial Call to Action for this study was on 2/26/2020 and the researchers closed enrollment on 9/28/2020. The study enrolled 120 participants, the majority of which were sourced through the Love Research Army.